Whoa, Tab!
You can't swap solid and hydraulic lifters without a cam change! The cam profile is different! That clearance on a solid lift cam is the same height as the "clearance ramp", which means there's a slow, gradual lift the same amount as the clearance specification. Hydraulic cams only have about .005" clearance ramps, because they run with essentially zero clearance all the time. Hydraulics on a solid shaft would have the same effect as a mild racing cam, opening the valves sooner, and closing them later. Also, cams and lifters MUST stay in the same relationship once they're run in, (cam lobe and lifter together) or the cam lobes can wear out in a hurry when different lifters are installed. If you want hydraulic lifters, you'll need to change to the correct cam, too.
If you pull the side plates off the engine, look at the tops of the lifters, where the pushrods fit. If there's a small spring clip holding the top into the lifter, it's hydraulic. Chevy solid lifters are one-piece units.
Jerry
